updated codecov action and use CODECOV_TOKEN

(added secret token to repo)

Author: orbeckst

.github/workflows/tests.yml

@@ -39,10 +39,11 @@ jobs:
         poetry run pytest -v --cov=multibind --cov-report=xml
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v4
+      uses: codecov/codecov-action@v5
       with:
         directory: .
         fail_ci_if_error: ${{ github.event_name == 'pull_request' }}
         files: coverage.xml
         name: codecov-umbrella
+        token: ${{ secrets.CODECOV_TOKEN }}
         verbose: true